My understanding is that it's using basically what the W3C is now considering. The browser manufacturers already decided on this months ago and implemented it. Now the question is if it becomes part of the standard so there aren't annoying differences between each browser.
Netflix already works on Linux, with Chrome and Firefox: https://help.netflix.com/en/node/23742
It uses EME with closed-source CDMs bundled with the browser (Chrome) or downloaded by the browser (Firefox).